Transferring Your Program to the Primary and Standby PLCs

Transferring Your Program

Because a Hot Standby system requires that identical application programs exist on both the primary and standby PLCs, you must download your application twice, once to each PLC.

The procedure is the same for both PLCs:

Step	Action
1	Connect the PC with Control Expert to a USB port on the PLC
2	Use the Control Expert command: PLC → Transfer program to PLC

NOTE: If your Hot Standby system is already configured and uses an Ethernet IO head, you must stop all your system before downloading a new application (same recommendation after a rebuild all).